/Engine/Source/Runtime/GeometryCore/Public/Spatial/MeshAABBTree3.h
Find the Vertex closest to P, and distance to it, within distance MaxDist, or return InvalidID
virtual int FindNearestVertex ( const FVector3d & P, double & NearestDistSqr, double MaxDist, const [FQueryOptions](API\Runtime\GeometryCore\Spatial\IMeshSpatial\FQueryOptions) & Options )